los mensajes de error son estos:
YAHOO -> Email Error: PASSWORD invalid mail server response: 535 authorization failed (#5.7.0)
GMAIL -> Email Error: AUTH LOGIN invalid mail server response: 530 5.7.0 Must issue a STARTTLS command first
Maybe your SMTP Server does'nt support authentification. Try to leave Username and Password blank in your settings
HOTPOP -> Email Error: RCPT TO invalid mail server response: 550 : Sender address rejected: Access Denied: This server is for HotPOP.com users ONLY, email
[email protected] for assistance.